Maximum Validity of a Test with Equivalent Items  

Oleh:

Tucker, Ledyard R.

Jenis: Article from Journal - e-Journal
Dalam koleksi: Psychometrika: A Journal of Quantitative Psychology vol. 11 no. 1 (Mar. 1946), page 1-13.
Topik: Validity; Test; Equivalent Items
Fulltext: Maximum Validity of a Test with Equivalent Items.pdf (496.85KB)

Isi artikel

It is assumed that a scale of true scores on a function exists and that the probability of answering an item correctly is a curve of the type of the integral of the normal curve. The product moment correlation between the test score and true score is derived for a normal distribution of subjects and a test composed of equivalent items. Numerical examples demonstrate that the maximum correlation between test scores and true scores occurs for a one hundred item test when the point correlation between items is less than three tenths.

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